Yan Qi slept lazily, and when she came out of the tent, a bunch of dark blue balloons were tied to the big stone outside the tent door, and they nodded at her one by one. Walk up and reach out to touch it, sure enough, it is made of oilcloth, thin and strong cloth, woven fine and dense almost impermeable, the cloth is soaked in tung oil more than once, in order to increase the stretch and toughness of the cloth, and there is probably a layer of gum or wax and the like, to say that the rubber is completely airtight and airtight, but it is also enough to support a short period of floating and flying.

Yan Qi untied the balloon and held it in his hand, followed the lively sound from afar, and saw a large group of craftsmen and soldiers fiddling with all kinds of tools and instruments in the open space were in full swing, and the two gentlemen of the Yan family and Cui Xi were standing next to watch.

"This is the best Mid-Autumn gift I have ever received. Yan Qi walked over and said to Cui Xi.

Cui Xi smiled brightly: "It's a pity that it's a bit rushed, otherwise all kinds of colors are made, and it looks bright." ”

"There are so many opportunities," Yan Qi looked at the several machines used to make hydrogen in the open space, which Cui Xi had designed long ago after research and improvement, and now it can be applied to practice immediately according to the drawings, and it can't be more convenient, "But let them be careful, they must stay away from open flames." Yan Qi knew that Cui Xi was careful, but he still told him, after all, it was those craftsmen and soldiers who were responsible for the actual operation, and anyone who was careless would be in danger of dying.

"Don't worry, these are the most accurate soldiers under your Lao Tzu," Yan Zichen heard a sentence next to him, and turned his face to look at Yan Qi, "Where did you know this method of making 'light air'?"

Yes, not only will she have to deal with her uncle and brother in the future, but now she has another father.

"You go ask Uncle about this, we have a case on the island. Yan Qi pushed on her uncle.

Her father didn't bother to pay attention to her, and asked Cui Xi instead: "After your test just now, it has been confirmed that this 'balloon' can carry a large amount of gunpowder for flight, so how to control its direction, and how to make the gunpowder fall and explode in the sky above Yao's barracks, do you have a way to do these two things?"

"It's not difficult to control the direction," Cui Xi said, "as long as there is wind, the balloon can fly downwind, and last night I saw that the wind came from the west, so the place where we can release the balloon can be on the top of the mountain west of the iron mine." ”

"You need to pay attention to the fact that the small balloon that was just used for the experiment lifted off very quickly," Yan Zichen is also a weapons expert, a senior in the handicraft world of the Splendid Academy, and he is definitely good at mechanical production," The wind in the morning is also a westerly wind, although the small balloon also flies with the wind, but because the ascent speed is too fast, when it flies to the west, it is already very high from the ground, and the big balloon that you want to make can carry gunpowder, although the ascent speed may not be as fast as the small balloon, but I think it will not fly out of a large westerly angle with the wind at the beginning, but can only slowly move westward in the process of rising, then if the balloon flies to a very high place, how do you control its position?"

"If you don't raise it," Cui Xi laughed unhurriedly, "tie it to the balloon with a long enough hemp rope, and the other end is in the hands of the people on the ground, and when it flies to a certain height, the ground will no longer release the rope, and then it can only drift westward with the direction of the wind, and according to the length of the hemp rope, we can also calculate whether its position in the air is in the center of the iron mine." ”

"Oh, indeed!" Yan Zichen also knew the algorithm, "then there is only one last problem left: how to get the gunpowder to fall into the iron ore and detonate." If you use the lead to ignite from the ground, the distance is too long, and the wind is strong at high altitude, it is easy to blow out, this method is not very safe, and if the gunpowder explodes in the air, it will not play a greater role in killing the Yao army, and the best time is to explode again when it falls on the Yao military camp plate. ”

"If it falls, you just need to find a way to separate the balloon from the gunpowder, right, uncle?" Yan Qidao.

"Oh. Yan Zike has been listening, Yan Qi suddenly shook a sentence, and he responded, "I think this is used to hold the balloon is a rope net, so you might as well make the lower half of these ropes flammable, and the upper half of the rope is fireproof, as long as you find a way to ignite the lower half of the rope, the balloon can fly away from the rope net on its own, and the gunpowder can also fall straight to the ground." ”

"This rope can be done!" Yan Zichen nodded.

"Something that is used to light a rope and is not afraid of being blown away by the wind is also easy to say - incense, the more the wind blows, the happier it is. "Yan Qidao.

"Since there is no control over the time when the balloon flies over Yao Ying, the incense cannot be placed on the balloon in the first place. Cui Xi said.

Alternatively, you can use the hemp rope and pulley that bind the balloon to make a track that can carry incense to the balloon. Yan Zichen touched his chin and looked at Cui Xi.

"No problem. Cui Xi smiled.

"Transmit the incense up, light the rope around the balloon, the rope burns off after the balloon flies away, and the gunpowder can fall directly into the Yao military camp, although the gunpowder is explosive after a violent collision, but there is no absolute in the world, we only have one chance, we can't have a fluke heart, or there must be a way to ignite with an open flame, and this open flame has to burn fast, slowly burn over, maybe Yao Jun will find out and then extinguish the idea. Yan Zichen continued to touch his chin and think.

Just as I was pondering it, I heard a sentence: "There is an open flame that burns quickly." From the mouth of his daughter, he looked at the small paralyzed face in front of him, thinking about why this little thing has so many tricks in his head, and he has said it, what strange things have he experienced in Beijing for more than ten years?

"Then tell me, what strange things are there to scare you?" Yan Zichen took her chin and teased her.

"Last year's Shangsi Festival, there was a murder on Guixu Lake in Beijing. Yan Qi said this, Yan Zike on the side had already laughed out with a "heh", and Cui Xi on the other side also looked at her with a smile on the corner of his lips.

Murder? What does this have to do with murder? Yan Zichen stared at this heart-to-heart old and young couple with his hands on his hips.

"There is a method of arson applied in the murder case, which is called by everyone," Yan Qi said slowly, "Tianhuo." ”

Yan Zichen was also impressed by his daughter's brain, and flexibly applied the murder methods of the murder case to other places......, which is also a skill! All right.

"Skyfire" The production process, Cui Xi has personally tested the success in that case, and now it is effortless to do, all the materials that need to be used, first took a cotton thread to rub the rope and did a small test to Yan Zichen to see, Yan Zichen passed the proposal to detonate the gunpowder by this method on the spot, and then will make a long rope, one end is tied to the gunpowder bag, and the other end is in the hands of the person on the ground, when the gunpowder bag falls from the air, it will immediately ignite the long rope that has been nitrified, and it only takes an instant to burn to the gunpowder bag, and the nitrocellulose burns fast and the fire is large, which fully meets all the conditions required by this operation！

When the plan of action was sorted, dialectic, and confirmed by two large, two small, and four people, the craftsmen and soldiers in the camp were completely busy, intensively preparing and processing all kinds of materials and utensils, and there was more than one balloon to be used to carry out the task.

Yan Zichen's style has always been vigorous and resolute, and the army he leads is naturally the same, the idea of bombing the Yao camp that only came to him last night has been fully prepared during the day today, and tonight, it is about to be truly put into action.

At the beginning of the day, the army pulled out the camp, and the "demolition detachment" carrying out the demolition task began to go up the mountain from the west with all the necessary equipment.

At the right time, the army under the mountain was divided into four routes, surrounded by iron ore from all sides, the short soldiers were in front, the long soldiers were in the center, the bowers and crossbowmen were in the rear, and the cavalry guarded the periphery, connecting layers and layers, integrating attack and defense, and not leaking.

At the beginning of the day, the demolition team arrived at the top of the mountain, found a shelter that had been explored during the day, and began to inflate the balloon and assemble gunpowder under the cover of the mountain.

When the ugly time was right, the "balloon bomb" was equipped, and Cui Xi led the craftsmen to conduct the final inspection.

At the beginning of the day, everything was ready, and Yan Zike, who personally went up to the top of the mountain to command, ordered the release of all eight balloons.

At the end of the day, eight balloons were steadily suspended above the location of Yao Ying in the middle of the iron mine.

The eight sticks of incense, which had an important mission, were slowly transported to the night sky along the hemp rope that pulled the balloons, and Yao Lida, who had controlled the Saibei regime for nearly 20 years, would never have thought that his fate was tied to these eight slender incense sticks.

Most of the people who went to the top of the mountain to carry out the mission had already withdrawn from the mountain, leaving only a team of soldiers who guarded against emergencies, Yan Zike who was in command, and Yan Qi who came up with bows and arrows on his back.

Everyone took out the earplugs they had prepared and retreated to safety, leaving only eight skilled soldiers in their place, responsible for lighting the special cotton rope to detonate the gunpowder.

Closer, the eight sticks of incense are getting closer and closer to the rope net.

Arrive at the bottom half of the net, which is flammable!

-- It burned -- Yao Jun, who was on duty at the bottom of the mine valley, was sleepy at this time, and at four o'clock in the morning it was the most lax and sleepy time for people, and no one noticed that there were more than a dozen fiery ropes burning rapidly in the sky high above their heads—— and burning! Eight igniters lit a special cotton rope, and eight heavenly fires cut through the night like eight sharp arrows and chased after the gunpowder bag that had fallen to the bottom of the mine—

- Boom - Boom - Boom -

The earth shook the mountains and rocks - a series of huge explosions could not stop penetrating the ear drums even if they stuffed the ears with something, and the annular mine below amplified the explosion several times and spread it towards the sky, and the strong air currents generated by the explosion shook the rocks under their feet as if they were cracking and shaking, and the firelight, thick smoke, and debris were surging up from the bottom of the valley, as if the scene of the end of the world after the comet hit the earth!

-- Succeeded! Attack methods that shocked the world -- balloons capable of flying into the sky, throwing gunpowder hundreds of meters into the air -- unbelievable! Who could have thought before this? Who would have dared to think like that?

Yao Lida, the emperor of Saibei who has been arrogant for 20 years, is his end! 166 Reading Network